OMG!?!? No-Crow collars? Well, we have no-bark collars for some of our more vocal dogs, so I guess that’s a THING now, LOL!
No-crow collars don’t shock the rooster at all. When a rooster crows, he puffs up an air sac in his throat, in addition to his lungs. The collar interferes with puffing up that air sac, so his voice comes out as a quiet, little crow, instead of the “wake the neighborhood” kind. It doesn’t interfere with his lungs at all.
(At least, according to what I’ve read about them. I haven’t tested them yet, but they aren’t crowing yet, either.)